Adaptive internally turbo-coded ultra wideband-impulse radio (AITC-UWB-IR) system

Naotake Yamamoto, Tomoaki Ohtsuki

Research output: Contribution to journalConference articlepeer-review

26 Citations (Scopus)


As a new spread spectrum system, an Ultra Wideband-Impulse Radio (UWB-IR) has attracted much attention in high speed indoor multiple access radio communications [1]. Since the UWB-IR system repeats and transmits pulses for each bit, the UWB-IR system is considered as a coded scheme with a simple repetition block code. As an error correcting code, Turbo-codes proposed by C. Berrou et al. in 1993 [2] have attracted much attention beyond the field of coding theory, because the performance is very close to the Shannon limit with practical decoding complexity. In this paper, we propose an adaptive internally Turbo-coded UWB-IR (AITC-UWB-IR) system. The proposed system employs a Turbo code in addition to a repetition block code and shares the transmission bandwidth adaptively between them. We evaluate the performance of the AITC-UWB-IR by theoretical analysis and computer simulation. From our numerical and simulation results, we show that the BER of the AITC-UWB-IR is superior to that of the SOC-UWB-IR on an AWGN channel when the bit rate is high We also showed that the AITC-UWB-IR system using low rate Turbo codes improves the BER on an AWGN channel and a real Gaussian fading channel. Consequently, we confirm that for the same bit rate, we had better make the code rate of Turbo codes lower and make the number of repetitions of the repetition codes smaller to achieve the better BER.

Original languageEnglish
Pages (from-to)3535-3539
Number of pages5
JournalIEEE International Conference on Communications
Publication statusPublished - 2003 Jul 21
Externally publishedYes
Event2003 International Conference on Communications (ICC 2003) - Anchorage, AK, United States
Duration: 2003 May 112003 May 15

ASJC Scopus subject areas

  • Computer Networks and Communications
  • Electrical and Electronic Engineering


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